<template>
  <view class="cart">
    <!-- 1 列表 -->
    <view 
    class="cart-list" 
    v-for="item in cartList"
    :key="item.goods_id"
    >
      <view class="cart-item">
        <!-- 1 复选框 -->
        <view class="goods-chk">
          <u-checkbox
            shape="circle"
            active-color="red"
            :value="item.checked"
            @change="handleToggleCheck(item.goods_id)"
          ></u-checkbox>
        </view>
        <!-- 2 图片 -->
        <view class="goods-img">
          <u-image
            width="191rpx"
            height="191rpx"
            :src="item.goods_small_logo"
          ></u-image>
        </view>
        <!-- 3 信息 -->
        <view class="goods-info">
          <!-- 名称 -->
          <view class="goods-name u-line-2">{{item.goods_name}}</view>
          <!-- 价格和数量 -->
          <view class="goods-price-num">
            <view class="goods-price">￥{{item.goods_price}}</view>
            <view class="goods-num-tool">
              <view 
              class="num-btn"
               @click="handleCartNumUpdate(-1,item.goods_id,item.num)"
              >-</view>
              <view class="goods-num">{{item.num}}</view>
              <view 
              class="num-btn"
              @click="handleCartNumUpdate(1,item.goods_id,item.num)"
              >+</view>
            </view>
          </view>
        </view>
      </view>

    </view>
    <!-- 2 统计 -->
    <view class="statistics">
      <view class="all-chk">
        <u-checkbox
          shape="circle"
          active-color="red"
          :value="isAllChecked"
          @change="handleAllCheck"
        >全选</u-checkbox>
      </view>
      <view class="all-price">
        合计: <text>￥{{totalPrice}}</text>
      </view>
      <view class="all-count">
        <u-button
          type="error"
          shape="circle"
          @click="handleGoPay"
        >去结算({{totalCount}})</u-button>
      </view>
    </view>
  </view>
</template>

<script>
import { mapState, mapMutations,mapGetters } from 'vuex'
export default {
  computed: {
    // vuex中购物车数据
    ...mapState('cart',["cartList"]),
    // 子选择按钮状态控制全选状态
    ...mapGetters('cart',["isAllChecked","totalCount","totalPrice","checkedCartList"])
  },
  methods: {
    ...mapMutations('cart',["cartToggleCheck","cartNumUpdate","cartAllToggle"]),
    // 商品的切换被选中 cartToggleCheck===这个更改的操作在vuex中
    handleToggleCheck(goods_id) {
      this.cartToggleCheck({value:goods_id})
    },
    // 商品数量的变化  vuex编辑数据 cartNumUpdate
    handleCartNumUpdate(unit,goods_id,num) {
      this.cartNumUpdate({value: { unit, goods_id, num } })
    },
    // 点击全选  cartAllToggle
    handleAllCheck() {
      this.cartAllToggle({value: this.isAllChecked})
    },
    // 去结算按钮，跳转至结算页面
    handleGoPay() {
      // 点击结算前，需要判断，是否有选中商品
      if(this.checkedCartList.length === 0) {
        uni.showToast({
          title: "您还没有选购商品哦",
          icon: "none",
        });
      }else {
        // 跳转路由
        console.log('跳转路由');
        uni.navigateTo({url: '/pages/pay/pay'})
      }
      
    }
  }
};
</script>

<style lang="scss">
.cart {
  padding-bottom: 111rpx;
  .cart-list {
    .cart-item {
      display: flex;
      padding: 10rpx;
      border-bottom: 1rpx solid #ccc;
      .goods-chk {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
      }

      .goods-img {
        flex: 2;

        display: flex;
        align-items: center;
        justify-content: center;
      }

      .goods-info {
        color: #666;
        flex: 3;
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        .goods-name {
        }

        .goods-price-num {
          display: flex;
          justify-content: space-between;
          .goods-price {
            color: $theme-color;
          }

          .goods-num-tool {
            width: 140rpx;
            height: 40rpx;

            display: flex;
            justify-content: space-between;
            .num-btn {
              border: 1rpx solid #ccc;
              border-radius: 50%;
              width: 40rpx;
              height: 40rpx;
              text-align: center;
              line-height: 40rpx;
            }
          }
        }
      }
    }
  }
  .statistics {
    position: fixed;
    background-color: #fff;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    border-top: 1rpx solid #ccc;
    display: flex;
    align-items: center;
    padding: 15rpx;
    .all-chk {
    }

    .all-price {
      flex: 1;
      color: #666;
      text {
      }
    }

    .all-count {
    }
  }
}
</style>